Influence of Heat-Treatment Cycles on the Microstructure, Mechanical Properties, and Corrosion Resistance of Co-Cr Dental Alloys Fabricated by Selective Laser ... View Full Text


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Article Info

DATE

2021-04-12

AUTHORS

Konstantinos Dimitriadis, Angeliki G. Lekatou, Athanasios K. Sfikas, Maria Roumpi, Sofia Tsouli, Aristidis Galiatsatos, Simeon Agathopoulos

ABSTRACT

The effect of repeated heat-treatment (HT) cycles, as precisely applied in the regular dental practice to produce metal-ceramic restorations, on microstructure, mechanical properties, and corrosion resistance of CoCrMo dental alloys, fabricated via the advanced digital technique of selective laser melting (SLM) (with the aid of CAD technology), is thoroughly investigated. Fifteen samples were subjected to four well-defined firing cycles. Crystallographic (by x-ray diffraction) and microstructure analyses (by SEM/BSE and EDS), measurements of mechanical properties (modulus of elasticity, Vickers micro-hardness, and yield strength), and corrosion resistance tests (by potentiodynamic polarization measurements in artificial saliva-simulating solution at 37 °C) along with the evaluation of the resultant microstructure after the corrosion tests were conducted in all prepared samples in order to shed light on the influence of the HT on the above properties. Compared to the as-prepared samples (15 samples), the heat-treated alloy presents a markedly refined microstructure with a notable carbide/Laves phase dissolution (which are present in as-prepared alloy) and extinction (to a large extent) of the dendritic/cellular morphology (which characterizes the as-prepared alloy). The mixed γ and ε composition persists; nevertheless, the amount of γ-phase increases. A small reduction in the values of the mechanical properties was recorded (i.e., the modulus of elasticity was reduced from 240 to 210 GPa, Vickers microhardness from 280 to 250 GPa, and yield strength from 841 to 752 MPa). However, the HT improved the resistance of the samples toward general corrosion, which is mainly ascribed to the stress relief and refined/uniform microstructure occurring due to the HT (ascribed to the intergranular coarse carbide/Laves phase dissolution). The alterations that were caused to the investigated samples owing to the HT were relatively small, suggesting that the Co-Cr dental alloys produced by SLM technique qualify for safe use in preparing metallic substrates of metal-ceramic dental restorations. More... »

PAGES

5252-5265

References to SciGraph publications

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  • 1990-08. The Co-Cr (Cobalt-Chromium) system in BULLETIN OF ALLOY PHASE DIAGRAMS
  • 1999-01. Thermodynamic assessment of the Co-Mo system in JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION
  • 2017-07-14. Study on Biocompatibility of CoCrMo Alloy Parts Manufactured by Selective Laser Melting in JOURNAL OF MEDICAL AND BIOLOGICAL ENGINEERING
  • 1999-05. Formation of hcp martensite during the isothermal aging of an fcc Co-27Cr-5Mo-0.05C orthopedic implant alloy in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2010-06-25. Isothermal Phase Transformation in Biomedical Co-29Cr-6Mo Alloy without Addition of Carbon or Nitrogen in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2020-03-23. Microstructures and Mechanical Properties of Dental Co-Cr-Mo-W Alloys Fabricated by Selective Laser Melting at Different Subsequent Heat Treatment Temperatures in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2019-12. Analysis of Structure and Mechanical Properties of Co–Cr–Mo Alloy Obtained by 3D Printing in PHYSICS OF METALS AND METALLOGRAPHY
  • 1984-07. Nucleation of recrystallization in a Co- Cr- Mo alloy in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2007-11-28. Martensitic Transformation in a Cast Co-Cr-Mo-C Alloy in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2013-04-04. Surface Properties and Corrosion Behavior of Co–Cr Alloy Fabricated with Selective Laser Melting Technique in CELL BIOCHEMISTRY AND BIOPHYSICS
  • 2018-06-11. Effects of In Situ Intermetallics on the Microstructural Array and Saline Corrosion Performance of Cast Al/WCp Composites in JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
  • 2007-11-10. Co-W (Cobalt-Tungsten) in JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION
  • 2002-07. Effect of fcc-hcp phase transformation produced by isothermal aging on the corrosion resistance of a Co-27Cr-5Mo-0.05C alloy in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2009-12-09. Solidification behaviour of ceramic particle reinforced Al-alloy matrices in JOURNAL OF MATERIALS SCIENCE
  • 2011-02-02. Precipitates in As-Cast and Heat-Treated ASTM F75 Co-Cr-Mo-C Alloys Containing Si and/or Mn in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2018-09-13. Microstructural Characterization, Mechanical Properties, and Corrosion Resistance of Dental Co-Cr-Mo-W Alloys Manufactured by Selective Laser Melting in JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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    http://scigraph.springernature.com/pub.10.1007/s11665-021-05738-9

    DOI

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    23 schema:description The effect of repeated heat-treatment (HT) cycles, as precisely applied in the regular dental practice to produce metal-ceramic restorations, on microstructure, mechanical properties, and corrosion resistance of CoCrMo dental alloys, fabricated via the advanced digital technique of selective laser melting (SLM) (with the aid of CAD technology), is thoroughly investigated. Fifteen samples were subjected to four well-defined firing cycles. Crystallographic (by x-ray diffraction) and microstructure analyses (by SEM/BSE and EDS), measurements of mechanical properties (modulus of elasticity, Vickers micro-hardness, and yield strength), and corrosion resistance tests (by potentiodynamic polarization measurements in artificial saliva-simulating solution at 37 °C) along with the evaluation of the resultant microstructure after the corrosion tests were conducted in all prepared samples in order to shed light on the influence of the HT on the above properties. Compared to the as-prepared samples (15 samples), the heat-treated alloy presents a markedly refined microstructure with a notable carbide/Laves phase dissolution (which are present in as-prepared alloy) and extinction (to a large extent) of the dendritic/cellular morphology (which characterizes the as-prepared alloy). The mixed γ and ε composition persists; nevertheless, the amount of γ-phase increases. A small reduction in the values of the mechanical properties was recorded (i.e., the modulus of elasticity was reduced from 240 to 210 GPa, Vickers microhardness from 280 to 250 GPa, and yield strength from 841 to 752 MPa). However, the HT improved the resistance of the samples toward general corrosion, which is mainly ascribed to the stress relief and refined/uniform microstructure occurring due to the HT (ascribed to the intergranular coarse carbide/Laves phase dissolution). The alterations that were caused to the investigated samples owing to the HT were relatively small, suggesting that the Co-Cr dental alloys produced by SLM technique qualify for safe use in preparing metallic substrates of metal-ceramic dental restorations.
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    32 Laves phase dissolution
    33 SLM technique
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    36 alloy
    37 alterations
    38 amount
    39 analysis
    40 cellular morphology
    41 composition
    42 corrosion
    43 corrosion resistance
    44 corrosion resistance tests
    45 corrosion tests
    46 crystallographic
    47 cycle
    48 dental
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    50 dental practice
    51 dental restorations
    52 digital techniques
    53 dissolution
    54 effect
    55 evaluation
    56 extinction
    57 firing cycles
    58 general corrosion
    59 heat treatment cycles
    60 heat-treated alloys
    61 increase
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    63 laser melting
    64 light
    65 measurements
    66 mechanical properties
    67 melting
    68 metal-ceramic dental restorations
    69 metal-ceramic restorations
    70 metallic substrates
    71 microstructure
    72 morphology
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    74 phase dissolution
    75 practice
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    77 properties
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    80 relief
    81 resistance
    82 resistance test
    83 restoration
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    85 safe use
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    97 schema:name Influence of Heat-Treatment Cycles on the Microstructure, Mechanical Properties, and Corrosion Resistance of Co-Cr Dental Alloys Fabricated by Selective Laser Melting
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